Elmer a



(No Model.)

E. A. SPERRY.

ELECTRIC ARG LAMP.

Patented July 19, 1892.

UNITED STATES PATENT QFFICEQ ELMER A. SPERRY, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE SPERRY ELECTRIC COMPANY, OF SAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 479,029, dated July 19, 1892.

Application filed April18, 1890. Serial No. 348A59. (No model.)

To aZZ whom it may concern:

Be it known that I, ELMER A. SPEREY, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois,have invented a certain new and useful Improvement in Electric Lights, of which the following is a full, clear, and exact specification.

My invention relates to arc lamps, specially such as are operated with one or more pairs of carbons, and has for its object to provide means whereby the operation of the carbons may be made more simple and efiective and the parts be held more securely in position.

My improvement is illustrated in the accompanying drawings, wherein Figure l isa cross-section of the upper part of the lamp; Fig. 2, a detail side view of the upper portion thereof; Fig. 3, a detail of the cut-out magnet, and Fig. 4 a diagrammatic view showing the carbons in their normal positions.

Like parts are indicated by the same letter in all of the drawings, and such details of the lamp as are not material to an understanding of the device are with it.

A is the case which surrounds the operating mechanism, having the top B and the bottom C.

D D are the rods which support the lowercarbon-securing devices.

E E are the carbon-rods projecting into the guides F F, the rod E provided with the cap G and the rod E with the annular groove H and surrounding clamp J, one end of which normally rests on the ledge K, and the other on the end of the lever L, from the other end of which extends a rod M into the guide F, which receives the carbon-rod E. This rod E is also provided with a second annular groove V, surrounded by one of the carbon-separating devices N the object of which is, as the two carbon-separating levers work together, that when the rod E is raised by being held in position by clamp J in its groove H the groove V allows its separatinglever to rise and fall, as occurs in the process of feeding, without touching or disturbing the rod E until the other pair of carbons is burned out.

N is a spring-supported frame resting upon the springs N N and carrying the carbonrod-operatin g devices, which embrace, briefly, the main-circuit electromagnet N and the carbon-separating device N N connected with the armature N of the said magnet. These parts are more fully described in my patent, No. 05,440, dated June 18, 1889, to which reference is had, should further light on the state of the art be thought desirable for an understanding of the features therein described, though it is not believed that any such reference is necessary.

0 is a dash-pot wherein the piston O and rod O which connect with the armature N to regulate its movement, are situated.

P P are the guides supported on the standards R, from which the spring-frame N is also supported, and the two guides P P are rigid and independently receive each one of the carbon-rods.

On one side of the elastically-supported frame N is the arm S, which rides upon the roller T on the lever T, which is controlled by the shunt-magnet T U is a rod having an angularly-bent end to engage the roller T, connected with the armature U of the cut-out magnet U which armature is adapted to engage the piece U and thus form a circuitthrough the conductors U and U which lead to the main conductors X X.

X and X are small conductors which connect the main conductors with the shunt-magnet T and X X are the conductors which connect the main conductors, respectively, with the upper and lower carbons.

The use and operation of my invention are as follows: The carbon-rod D' is retained permanently in an elevated position, suspended in the air, and free from contact with the carbon. D by means of clamp J, and it is notuntil by the gradual feeding away or consuming of the carbon D held by the carbon-rod E, and the consequent engagement of head G with the rod M that the carbon-rod E is released. The clamp J is normally at all times (from the trimming of the lamp or supplying of carbons until the carbon D is set in efiective operation) in the position shown in Fig. 1. The office of the groove I'Iisto give the clamp IOO J a firmer grip on the rod E, thereby reducing the liability ofbeing jarred off, as might occur on the plane surface of the rod, and also to afford a permanent stop for the clamp J, so that the groove V will always be encircled by the lever N when rod E is at rest at its upper position before starting. The rod E remains in the position shown in Fig. 1 from the time the lamp is trimmed till by the burning out of the carbons D and D the cap on rod E strikes the rod M, which tilts the lever L, which in turn raises and keeps raised the ring-clamp J, letting the rod E descend, and thereby contacting the carbons D and D bringing the groove V out of range of lever N and now, as the the lever N is working on the plane surface of the rod E, the feed- 1 ing proceeds as in the case of rodE; but when the carbon 1) is burned out the head G has descended upon the rod M, the lever L is to move in opposition to its commanding spring, and the clamp J is brought and retained in a horizontal position, whereupon the rod N is free to slide thereto. It immediately drops, bringing the two carbons D and D together and establishing a circuit, which has beeninterrupted by the burning out of the carbon D and the lamp proceeds to feedin the usual manner. The carbon D is hung up, as it were, in the air, and may be any desired distance from the carbon D andisneverbrought in contact therewith until the other carbons D and D have been burned out.

The office of the guides P P is to prevent injury to the parts and strain to the more delicate portions of the spring-frame when the same is manipulated by careless persons. The office of guide W is to steady the rod E near the clamp J, and also to keep the clampin position. The office of the rod U is to close the cut-out circuit and cut out the entire lamp when so great a current has been diverted into the shunt-circuit as to bring the spring-frame down a distance, the rod U so acting by reason of its contact with the roller T, which must descend with such springframe.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is as follows:

1. In an arc lamp, the combination of two pairs of carbons with encircling feedingclamps for the two upper carbon-rods and a similar suspending-clamp for one of such carbon-rods, and a groove or ledge encircling said carbon-rod and receiving such clamp, so as to retain such carbon-rod at a proper elevation for a determinate period, as and for the purpose shown and described.

2. In an electric-arc lamp, the combination of a spring-supported frame with a shunt magnet, a lever on which such frame rests, a cut-out magnet normally open, and an angularly-bent rod one end of which is attached to a lever by which the cut-out magnet can be closed and the other placed in proximity to a moving portion of the spring-supported frame of the shunt-magnet lever.

3. In an arc lamp, the combination of two pairs of carbons with feeding-clamps for the two upper carbon-rods and a suspendingclamp for one of such carbon-rods, and a groove or ledge encircling one of said carbonrods and receiving such clamp so as to retain such carbon-rod ataproper elevation, the same carbon-rod being also provided with a second groove or ledge encircled by one of the feeding-clamps, so as to prevent feeding of this carbon when the other carbon is burning.

4. In an arc lamp, the combination of two pairs of carbons with feeding-clamps for the two upper carbon-rods and a suspendingclamp for one of such carbon-rods, the same carbon-rod being also provided with a second groove or ledge encircled by one of the feeding-clamps, so as to prevent feeding of this carbon when the other carbon is burning.

5. In an arc lamp, the combination of two pairs of carbons with feeding-clamp N for the two upper carbon-rods E and E and a suspending-clamp J, encircling a groove or ledge H on carbon-rod E at a proper elevation, the carbon-rod E being also provided with a second groove or ledge V, the said groove or ledge V being encircled by one of the feeding-clamps N so as to prevent feeding of carbon D when carbon D is burning, the said rod E being released by action of the rod E raising the clamp J, thereby allowing rod E to descend.

ELMER A. SPERRY.

Witnesses:

W. R. GOODMAN, D. LEVIN. 

